Holley EFI systems seem to be quite good but you really don't need EFI for a car to be daily driver-friendly. Don't get me wrong I'd love it if my Duster had it but it's reliable as a hammer with the Street Demon carb. I'm going to start driving it to work more often once the temps cool down here, it's just too hot during the day right now to drive a car without A/C. I'd put the money from an EFI system into better heads and/or that TKX setup you mentioned but that's JMO.
To answer your main questions a bit better, a good roller cam with around 224° @ .050" duration on a 108° LSA will have just a slight bit of chop with 10:1+ compression and be completely street-friendly with good low-end and a wide power band. I had Jim at Racer Brown custom grind me a cam for my 5.9L with similar but slightly milder specs (for high altitude and lower compression) and couldn't be happier with the results. You'll also be ahead reusing stock Magnum lifters, aftermarket hydraulics have a chance of either collapsing or wiping out (flat tappets).
Overall don't be afraid to reuse "old" parts. The factory components in Magnum engines are very good quality (minus the crack-prone heads), certainly more than a lot of current aftermarket stuff. I basically reused an entire high-mileage (150k+) junkyard short block, just added fresh rod bearings and it runs like a champ with 10k miles so far.